. >>> and lance armstrong has been spilling the dirty truth. he was more emotional in his two-part confession to oprah winfrey. >> reporter: lance armstrong apologized to his fans. and all those who believed in him. in part two of his interview with oprah winfrey. the disgraced cyclist spoke directly to those who wore his livestrong bracelets and stood by him during his decade of lying about doping. >> i understand your anger, your sense of betrayal. >> uh-huh. >> you supported me forever, through all of this, and you believed. and i lied to you. and i'm sorry. >> reporter: armstrong said his first wife, christin, new about the use of performance- enhancing drugs. he also said his lowest moment wasn't his being stripped of his cycling titles. it was when his own livestrong foundation asked him to step away. >> it was the best thing for the organization. but it hurt like hell. >> reporter: the disgraced cyclist got emotional when talking about how one of his children had been defending him to kids in school. >> i told luke, i said -- i said don'